Normalizing capacitive sensing measurements to reduce effects of low ground mass and noise

A processing system, comprising:

• a sensor module configured to drive a first plurality of capacitive sensing signals in parallel onto a first group of a plurality of sensor electrodes, the plurality of sensor electrodes are arranged in rows and columns, each row and column comprises at least three sensor electrodes;
• a determination module configured to:
• generate a first plurality of capacitive measurements corresponding to the first group of the plurality of sensor electrodes in response to driving the first plurality of capacitive sensing signals;
• normalize a first capacitive measurement corresponding to one of the plurality of sensor electrodes in the first group using a combination of the first plurality of capacitive measurements;
• and
• determine a location of an input object at least partially based on at least one of:
• a comparison of the normalized first capacitive measurement and a detection threshold, wherein the normalized first capacitive measurement is adjusted at least partially based on a number of non-zero capacitive measurements in the first plurality of capacitive measurements generated in response to driving the first plurality of capacitive sensing signals;
• and
• a comparison of the normalized first capacitive measurement and the detection threshold, wherein the detection threshold is adjusted at least partially based on at least a portion of the first plurality of capacitive measurements generated in response to driving the first plurality of capacitive sensing signals.

A method, comprising:

• driving a first plurality of capacitive sensing signals in parallel onto a first group of a plurality of sensor electrodes, wherein the plurality of sensor electrodes are in a sensing region of an input device and are arranged in rows and columns, each row and column having at least three sensor electrodes;
• generating a first plurality of capacitive measurements corresponding to the first group of the plurality of sensor electrodes in response to driving the first plurality of capacitive sensing signals;
• normalizing a first capacitive measurement corresponding to one of the plurality of sensor electrodes in the first group using a combination of the first plurality of capacitive measurements;
• and
• determining a location of an input object at least partially based on at least one of:
• a comparison of the normalized first capacitive measurement and a detection threshold, wherein the normalized first capacitive measurement is adjusted at least partially based on a number of non-zero capacitive measurements in the first plurality of capacitive measurements generated in response to driving the first plurality of capacitive sensing signals;
• and
• a comparison of the normalized first capacitive measurement and the detection threshold, wherein the detection threshold s adjusted at least partially based on at least a portion of the first plurality of capacitive measurements generated in response to driving the first plurality of capacitive sensing signals.